sensors on back of block?

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ok so there are 2 sensors on the back of my obd-1 b16 and want to know exactly wat they are. one is a 1 prong sensor sticking out and the other is a black plug type sensor(possible knock sensor?) and also wondering were my thermostat sensor is located. some one said in the thermo housing and were is that located.
The sensor with the one nipple sticking out is your oil sending unit, mainly used for your oil light to come on. that black sensor is in-fact the knock sensor...your thermostat housing is behind the head just below and a couple inches to the left of your distributor. you can't miss it.